—Philip has gone to New Zealand. —Oh, can you tell me ________？ A．when did he leave B．when he is leaving C．when he left D．when is he leaving
You look pale. ____ have a good rest? A. Why don’t B. Why are you C. Why not D. Why you don’t
My doctor advised me to take the medicine t________ a day, in the morning and evening.
选出注音和字形没有错误的一组（ ） A．阜盛（fǔ） 敕造（chì） 规矩（jｕ） 亲和力 声名雀起 B．两靥（yè） 忖度（cǔn）
When______this kind of computer _______? A.is; used B. was; used C. did; use D. are; used
下列说法中不正确的是 （ ） A．将纯水加热至较高温度，水的离子积变大，pH变小，呈中性 B．氨水和盐酸混合后溶
科学家利用“同位素标记法”了解到许多化学反应的详细过程。下列说法正确的是( ) A．用32P标记DNA，弄清了DNA分子的复制方式 B．用18O标记
He (go) to the park on Sundays.
